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Photo Credit: U.S. Army photo by Sgt. 1st Class Manuel Torres-Cortes, Army North PAO

CAMP BULLIS, Texas - Sgt. 1st Class Somphot Hongtong, operations noncommissioned officer, Headquarters Support Company, U.S. Army North, explains the position of the aperture site on the M-16A2 Rifle Jan. 20, to Capt. Philip Lee, attorney, Army North, during the company's advanced marksmanship training at the Camp Bullis Military Training Reservation in San Antonio.